Duffel bag



FIG. 1 is a top, front, left perspective view of a duffel bag showing my new design;

FIG. 2 is a top, rear, left perspective view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof; and,

FIG. 6 is a top view thereof.

The uneven length broken lines immediately adjacent to the shaded area represent the bounds of the claimed design. The even length broken lines illustrate portions of the duffle bag and form no part of the claimed design. 

CLAIM The ornamental design for a duffel bag, as shown and described. 